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Message-Id: <20250716004538.2720239-1-paulmck@kernel.org> Date: Tue, 15 Jul 2025 17:45:37 -0700 From: "Paul E. McKenney" <paulmck@...nel.org> To: rcu@...r.kernel.org Cc: linux-kernel@...r.kernel.org, kernel-team@...a.com, rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org> Subject: [PATCH RFC 1/2] doc: Update whatisRCU.rst for recent RCU API additions Bring this file kicking and screaming into the year 2025! Signed-off-by: Paul E. McKenney <paulmck@...nel.org> --- Documentation/RCU/whatisRCU.rst | 150 +++++++++++++++++++++++++------- 1 file changed, 118 insertions(+), 32 deletions(-) diff --git a/Documentation/RCU/whatisRCU.rst b/Documentation/RCU/whatisRCU.rst index be2eb6be16ece..6c69c20086e14 100644 --- a/Documentation/RCU/whatisRCU.rst +++ b/Documentation/RCU/whatisRCU.rst @@ -1021,32 +1021,41 @@ RCU list traversal:: list_entry_rcu list_entry_lockless list_first_entry_rcu + list_first_or_null_rcu + list_tail_rcu list_next_rcu + list_next_or_null_rcu list_for_each_entry_rcu list_for_each_entry_continue_rcu list_for_each_entry_from_rcu - list_first_or_null_rcu - list_next_or_null_rcu + list_for_each_entry_lockless hlist_first_rcu hlist_next_rcu hlist_pprev_rcu hlist_for_each_entry_rcu + hlist_for_each_entry_rcu_notrace hlist_for_each_entry_rcu_bh hlist_for_each_entry_from_rcu hlist_for_each_entry_continue_rcu hlist_for_each_entry_continue_rcu_bh hlist_nulls_first_rcu + hlist_nulls_next_rcu hlist_nulls_for_each_entry_rcu + hlist_nulls_for_each_entry_safe hlist_bl_first_rcu hlist_bl_for_each_entry_rcu RCU pointer/list update:: rcu_assign_pointer + rcu_replace_pointer + INIT_LIST_HEAD_RCU list_add_rcu list_add_tail_rcu list_del_rcu list_replace_rcu + list_splice_init_rcu + list_splice_tail_init_rcu hlist_add_behind_rcu hlist_add_before_rcu hlist_add_head_rcu @@ -1054,34 +1063,53 @@ RCU pointer/list update:: hlist_del_rcu hlist_del_init_rcu hlist_replace_rcu - list_splice_init_rcu - list_splice_tail_init_rcu hlist_nulls_del_init_rcu hlist_nulls_del_rcu hlist_nulls_add_head_rcu + hlist_nulls_add_tail_rcu + hlist_nulls_add_fake + hlists_swap_heads_rcu hlist_bl_add_head_rcu - hlist_bl_del_init_rcu hlist_bl_del_rcu hlist_bl_set_first_rcu RCU:: - Critical sections Grace period Barrier - - rcu_read_lock synchronize_net rcu_barrier - rcu_read_unlock synchronize_rcu - rcu_dereference synchronize_rcu_expedited - rcu_read_lock_held call_rcu - rcu_dereference_check kfree_rcu - rcu_dereference_protected + Critical sections Grace period Barrier + + rcu_read_lock synchronize_net rcu_barrier + rcu_read_unlock synchronize_rcu + guard(rcu)() synchronize_rcu_expedited + scoped_guard(rcu) synchronize_rcu_mult + rcu_dereference call_rcu + rcu_dereference_check call_rcu_hurry + rcu_dereference_protected kfree_rcu + rcu_read_lock_held kvfree_rcu + rcu_read_lock_any_held kfree_rcu_mightsleep + rcu_pointer_handoff cond_synchronize_rcu + unrcu_pointer cond_synchronize_rcu_full + cond_synchronize_rcu_expedited + cond_synchronize_rcu_expedited_full + get_completed_synchronize_rcu + get_completed_synchronize_rcu_full + get_state_synchronize_rcu + get_state_synchronize_rcu_full + poll_state_synchronize_rcu + poll_state_synchronize_rcu_full + same_state_synchronize_rcu + same_state_synchronize_rcu_full + start_poll_synchronize_rcu + start_poll_synchronize_rcu_full + start_poll_synchronize_rcu_expedited + start_poll_synchronize_rcu_expedited_full bh:: Critical sections Grace period Barrier - rcu_read_lock_bh call_rcu rcu_barrier - rcu_read_unlock_bh synchronize_rcu - [local_bh_disable] synchronize_rcu_expedited + rcu_read_lock_bh [Same as RCU] [Same as RCU] + rcu_read_unlock_bh + [local_bh_disable] [and friends] rcu_dereference_bh rcu_dereference_bh_check @@ -1092,9 +1120,9 @@ sched:: Critical sections Grace period Barrier - rcu_read_lock_sched call_rcu rcu_barrier - rcu_read_unlock_sched synchronize_rcu - [preempt_disable] synchronize_rcu_expedited + rcu_read_lock_sched [Same as RCU] [Same as RCU] + rcu_read_unlock_sched + [preempt_disable] [and friends] rcu_read_lock_sched_notrace rcu_read_unlock_sched_notrace @@ -1104,46 +1132,104 @@ sched:: rcu_read_lock_sched_held +RCU: Initialization/cleanup/ordering:: + + RCU_INIT_POINTER + RCU_INITIALIZER + RCU_POINTER_INITIALIZER + init_rcu_head + destroy_rcu_head + init_rcu_head_on_stack + destroy_rcu_head_on_stack + SLAB_TYPESAFE_BY_RCU + + +RCU: Quiescents states and control:: + + cond_resched_tasks_rcu_qs + rcu_all_qs + rcu_softirq_qs_periodic + rcu_end_inkernel_boot + rcu_expedite_gp + rcu_gp_is_expedited + rcu_unexpedite_gp + rcu_cpu_stall_reset + rcu_head_after_call_rcu + rcu_is_watching + + +RCU-sync primitive: + + rcu_sync_is_idle + rcu_sync_init + rcu_sync_enter + rcu_sync_exit + rcu_sync_dtor + + RCU-Tasks:: - Critical sections Grace period Barrier + Critical sections Grace period Barrier - N/A call_rcu_tasks rcu_barrier_tasks + N/A call_rcu_tasks rcu_barrier_tasks synchronize_rcu_tasks RCU-Tasks-Rude:: - Critical sections Grace period Barrier + Critical sections Grace period Barrier - N/A N/A - synchronize_rcu_tasks_rude + N/A synchronize_rcu_tasks_rude rcu_barrier_tasks_rude + call_rcu_tasks_rude RCU-Tasks-Trace:: - Critical sections Grace period Barrier + Critical sections Grace period Barrier - rcu_read_lock_trace call_rcu_tasks_trace rcu_barrier_tasks_trace + rcu_read_lock_trace call_rcu_tasks_trace rcu_barrier_tasks_trace rcu_read_unlock_trace synchronize_rcu_tasks_trace + guard(rcu_tasks_trace)() + scoped_guard(rcu_tasks_trace) -SRCU:: +SRCU list traversal:: + list_for_each_entry_srcu + hlist_for_each_entry_srcu - Critical sections Grace period Barrier - srcu_read_lock call_srcu srcu_barrier - srcu_read_unlock synchronize_srcu - srcu_dereference synchronize_srcu_expedited +SRCU:: + + Critical sections Grace period Barrier + + srcu_read_lock call_srcu srcu_barrier + srcu_read_unlock synchronize_srcu + srcu_read_lock_fast synchronize_srcu_expedited + srcu_read_unlock_fast get_state_synchronize_srcu + srcu_read_lock_nmisafe start_poll_synchronize_srcu + srcu_read_unlock_nmisafe start_poll_synchronize_srcu_expedited + srcu_read_lock_notrace poll_state_synchronize_srcu + srcu_read_unlock_notrace + srcu_down_read + srcu_up_read + srcu_down_read_fast + srcu_up_read_fast + guard(srcu)() + scoped_guard(srcu) + srcu_read_lock_held + srcu_dereference srcu_dereference_check + srcu_dereference_notrace srcu_read_lock_held -SRCU: Initialization/cleanup:: + +SRCU: Initialization/cleanup/ordering:: DEFINE_SRCU DEFINE_STATIC_SRCU init_srcu_struct cleanup_srcu_struct + smp_mb__after_srcu_read_unlock All: lockdep-checked RCU utility APIs:: -- 2.40.1
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